North Korean hackers used a novel vulnerability in Google Chrome to inject malware into the computers of individuals working in media, information technology, fintech and other industries early this year, security analysts at Google say.

The latest campaigns exposed weaknesses in the world’s most popular internet browser, further demonstrating the sophistication of Pyongyang’s hacker legions that have reportedly earned the Kim Jong Un regime hundreds of millions for its weapons programs.

According to a blog post from Google’s Threat Analysis Group (TAG), hackers connected to two distinct Pyongyang-backed cyber groups — Operation Dream